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Old 05-30-2014, 10:39 AM   #41
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The raw water pump fitted to a Perkins engine is normally a Jabsco. the pump should be self priming. As you've changed the valve I would start at the raw water strainer and check that water is in fact coming into it, if not the valve is faulty/blocked.
If you have water in the strainer simply disconnect each section in turn to trace the flow.
Before you start to work on it make sure your bilge pump is working.
You can now buy a 'run dry' impeller for Jabsco pumps, I have modified mine with a 'Speed seal' cover and screws which allows a quick inspection/impeller change needing only a pair of long nose angled pliers.
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Old 05-30-2014, 06:00 PM   #42
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Did you get your problem solved? We gotta know what the fix was .
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Old 05-30-2014, 07:34 PM   #43
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Headed to the boat as I type

Il will FOR SURE keep you all posted.
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Old 05-30-2014, 10:50 PM   #44
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Ok. So my BIL and partner in crime and I worked on Nimbus

Backing up.... I had the CAV unit on the over hearing engine rebuilt before I pulled the boat this spring. When I removed the CAV unit I shut the GATE valve off. It failed in the off position which we DIDNT KNOW UNTIL we restarted the engine and ran it for a while. Obviously it over heated.

We figured that out and rebuilt the thru hull system with ball valves as we had been planning on replacing those monkey gate valves.

Pulled Nimbus, did all the bottom paint, thru hulls, zincs and various other misc stuff.

Put Nimbus back in and tried out the engines. The strbd (over hearing engine of discussion) started right up. The port wouldn't start, but that's a different thread.

We ran the strbd engine until we noticed it was getting up to 180 REALLY QUICKLY and we shut her down.

And that's where this problem solving started.

Long story short, the failed gate valve caused a failed impeller. We replaced the failed impeller with a new one AND A THICK GASKET!

The thick gasket didn't allow the new impeller to work and caused the new impeller to fail.

I posted this thread and had TONS OF GREAT INPUT and tried again this afternoon.

We put in a NEW IMPELLER and we made a gasket out of a thin paper bag. We reassembled and disconnected a junction AFTER the impeller to see if it was working BEFORE the engine overheated.

Quickly the water was flowing and we shut the engine down and reconnected everything. We cast off and took it for a trial run. The Strbd engine heated up more quickly then the port as usual. We ran for about an hour and the strbd engine never got over 170.

We put the DONE stamp on that beotch !
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Old 05-31-2014, 05:51 AM   #45
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Go back and see what solutions were offered and when they were suggested in the troubleshooting process

As many people point out here....the first things to check are the simple things and the things not done/done differently that are often the culprit.
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Old 05-31-2014, 07:30 AM   #46
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Yes, quite a few of us felt if it wasn't a blocked intake or airlock in the strainer, then it had to be that thick new pump gasket...
Glad your quandary is finally solved. Now...happy sailing..!
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Old 05-31-2014, 01:34 PM   #47
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Yeah. I was thinking it was an air bible or the gasket or the impeller .

But I didn't think the impeller would go bad as easily as it did. We changed the impeller and gasket a couple of times but never at the SAME time which threw off resolving the problem.

All the advice on here lead me in the right direction. Thanks again !!
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Old 06-03-2014, 11:21 AM   #48
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Really glad you got sorted, if I ever have to change an impeller I use washing-up liquid to lubricate it for first few minutes of start up (it helps with the fitting too).
Before replacing an impeller I always put a wet/dry vacuum nozzle up the water feed pipe in the direction of the heat exchanger to suck out any crud or little bits of broken impeller.
I hope someone finds these tips helpful.
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Old 06-03-2014, 11:26 AM   #49
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Just changed mine .It has 8 veins and 4 were broke . Found all 4 at the front of the oil cooler .
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Old 06-03-2014, 12:07 PM   #50
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I meant vanes not veins
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Old 06-03-2014, 12:29 PM   #51
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Quote:
Originally Posted by Pack Mule View Post
I meant vanes not veins
My veins would be popping too if I found four broken vanes. Replacing impellers prior to breakage is not a sin and can in fact prevent ruined engines.
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Old 06-03-2014, 12:38 PM   #52
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My veins would be popping too if I found four broken vanes. Replacing impellers prior to breakage is not a sin and can in fact prevent ruined engines.
Yes your right and I know I was lucky . I was surprised when I found that four were broke . It was running around 185 and usually runs 175 to 180 . I made sure that all 4 matched up with the old impeller.
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Old 06-03-2014, 12:39 PM   #53
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Good for you!! I did the thicker gasket thing once too. . . . and more importantly only once!! Figuring out what is wrong and how to fix it correctly is a learning process and we can all learn by the experience of others or by trial and error!! Though the latter is the preferred method!!
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